One vertex per element, one color per generator, with an edge from x to x·s.
(7,12)(8,11)(13,14)(15,16)(17,19)(18,20)(21,22)(23,26)(24,27)(25,30)(28,33)(29,31)(32,35)(34,36) involution — undirected(2,4)(5,6,10,9)(7,11,12,8)(13,15,17,20)(14,16,19,18)(22,23)(24,31)(28,30)(32,36)(1,2)(3,4)(5,7,10,12)(6,11,9,8)(13,15)(14,18)(16,19)(17,20)(21,23,26,22)(24,29,31,27)(25,30,33,28)(32,35,36,34)(5,8)(6,7)(9,12)(10,11)(21,24,26,31)(22,27,23,29)(25,32,33,36)(28,34,30,35)(5,9,10,6)(7,8,12,11)(13,16,17,18)(14,15,19,20)(21,25,26,33)(22,28,23,30)(24,32,31,36)(27,34,29,35)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.